256 Callospermophilus lateralisto southern California and Nevada (USA). Their range is
somewhat fragmented, especially in the south.
geographic variation: Thirteen subspecies are recog-
nized.
C. l. lateralis—mountain slopes of western states, from Wyo-
ming south to Arizona and New Mexico (USA). The man-
tle is rusty yellow to bright chestnut.
C. l. arizonensis—San Francisco Mountains, Arizona (USA).
This is a larger and richer-colored form. The ventral sur-
face of the tail is dull gray.
C. l. bernardinus—San Bernardino Mountains, California
(USA). The mantle is dull fulvous, and the head is dark.
C. l. castanurus—Wasatch Mountains (Utah) north to Wyo-
ming (USA). The mantle is bright rusty chestnut. The
back is grizzled red brown, black, and yellow.
C. l. certus—Charleston Mountains, southern Nevada (USA).
It is “distinguished by pale general coloration in com-
bination with dark russet under side of tail... a dark,
rich russet, instead of ochraceous-buff or ochraceous-
tawny tone” (Goldman). The mantle is tawny to tawny
ochraceous.
C. l. chrysodeirus—mountains of southern and eastern Ore-
gon south to Tulare County, California (USA). The inner
black stripes are well defi ned. The mantle is rusty chest-
nut, while the rest of the back is grizzled gray, light
brown, and black.
C. l. cinerascens—Alberta (Canada) south through Idaho and
Montana to Yellowstone National Park (USA). The inner
black stripes are relatively short. The mantle is dark
chestnut red, and the rest of the back is grayish. The dor-
sal surface of the tail is mixed black and pale buff.
C. l. connectens—Homestead, Oregon (USA). The mantle is
cacao brown. The ventral surface of the tail is cinnamon,
and the dorsal surface is fuscous black.
C. l. mitratus—South Yolla Bolly Mountain, California (USA).
The back is paler gray and brown. The mantle is russet
to dark rusty chestnut.
C. l. tescorum—Alberta and British Columbia (Canada), near
the Moose Pass branch of the Smoky River. The mantle
is extensive and dark reddish brown. This form is larger,
and the back is brownish gray.
C. l. trepidus—Pine Forest Mountains, Humboldt County,
Nevada (USA). The mantle is light ochraceous. The rest
of the back is grizzled ochraceous, black, and white.
C. l. trinitatus—Trinity Mountains, east of Hoopa Valley,
Ca lifornia (USA). This is a larger form, with a darker gen-
eral color. The ventral side of the tail is dark chestnut.
C. l. wortmani—Sweetwater County (Wyoming) south into
the northwestern corner of Colorado (USA). The inner
pair of black stripes is usually missing. The mantle is a
paler reddish brown. The hands and feet are almost
white. The general color is paler.conservation: IUCN status—least concern. Population
trend—stable.Callospermophilus lateralis. Photo courtesy Phil Myers.